Guide member for use in a valve actuator assembly
a technology for valve actuators and guide members, which is applied in the direction of valve housings, soldering devices, manufacturing tools, etc., can solve the problems of positioner failure, diaphragm plate crimping or deformation, and damage to any of the parts
Active Publication Date: 2014-09-02
FISHER CONTROLS INT LLC
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The present invention provides a guide member for use in a valve actuator assembly to stabilize an actuator stem. The guide member includes a top wall and a side wall extending along the actuator stem's longitudinal axis. The top wall has a center aperture to receive the actuator stem and prevent displacement in a normal direction. The guide member's outer surface engages with a portion of the windings' inner surface to limit displacement of the actuator stem. The technical effect of this invention is to provide a reliable and secure guide for the actuator stem, ensuring its stability during operation.
Problems solved by technology
Such transverse displacement of the valve stem and the diaphragm plate relative to the actuator housing may damage any of all of the parts due to mutual contact.
For example, such contact may create friction and / or may cause the diaphragm plate to crimp or deform the diaphragm.
This transverse displacement may also result in positioner failures, packing failures, and other general performance issues.
Moreover, the upper guide adds weight and changes the center of gravity of the actuator assembly, both of which are undesirable in seismic environments.
Method used
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Embodiment Construction
[0012]As illustrated in FIG. 1, a valve actuator assembly 10 includes an upper actuator casing 12 and a lower actuator casing 14 coupled to the upper actuator casing 12, and the lower actuator casing 14 includes a spring aperture 16. A diaphragm 18 is disposed between the upper actuator casing 12 and the lower actuator casing 14. The valve actuator assembly 10 also includes a diaphragm plate 20 disposed between the diaphragm 18 and the lower actuator casing 14, and the diaphragm plate 20 has a top surface 22 and a bottom surface 24. A lower surface 26 of the diaphragm 18 engages the top surface 22 of the diaphragm plate 20, and a stem projection 28 downwardly extends from the bottom surface 24 of the diaphragm plate 20. The valve actuator assembly 10 further includes a spring housing 30 that extends along a longitudinal axis 32. The spring housing 30 has an inner surface 34 defining an interior volume 36, and the spring housing 30 further includes an open first end 38, wherein the o...
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Abstract
A valve actuator assembly includes a housing having a diaphragm plate and diaphragm disposed within the housing. A stem projection downwardly extends from a bottom surface of the diaphragm plate, and the stem projection is coupled to an actuator stem disposed along a longitudinal axis. A guide member has a top wall and a center aperture that receives the stem projection, and the top wall is biased into engagement with the bottom surface of the diaphragm plate by a spring. The guide member also has a side wall that downwardly extends from the top wall, and an outer surface of the side wall is adapted to engage an inner surface of a spring housing to limit displacement of the diaphragm plate and the actuator stem in a direction normal to the longitudinal axis.
Description
FIELD OF THE INVENTION[0001]The present invention relates generally to valve assemblies. More specifically, the present invention relates to a guide member for use in a valve actuator assembly.BACKGROUND OF THE INVENTION[0002]Automated control valves such as, for example, cage guided control valves, are often used in process control plants or systems to control the flow of process fluids. A cage-guided control valve typically includes an actuator (e.g., a pneumatic actuator, an electric actuator, a hydraulic actuator, etc.) operatively coupled to a first end of a valve shaft that extends along a longitudinal axis. Typically, the actuator includes an actuator housing that comprises an upper actuator casing and a lower actuator casing, and a diaphragm is secured between the upper and lower actuator casings of the actuator housing. A diaphragm plate is disposed below the diaphragm within an interior volume of the lower actuator casing, and a first end of the valve shaft is coupled to a...
Claims
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IPC IPC(8): F16K31/00
CPCF16K3/246Y10T29/49405F16K27/08F16K31/1264
Inventor ALMAN, PAUL T.LU, HANBING
Owner FISHER CONTROLS INT LLC